Device and method for producing quantitative-diameter spray droplets of pesticide

ABSTRACT

In a device for producing quantitative-diameter spray droplets of pesticide, a driving motor is controlled by a control center, the driving motor drives a lead screw, the lead screw drives a sliding device to achieve a designated accurate position on a guide track, and a piston moves slowly along with the sliding device to extrude chemicals in a droplet generator quantitatively, the chemicals extruded by the piston through the motion in a droplet cavity forms small single droplets through a guide pipe, the droplets with specific particle size are further generated by precisely controlling the extrusion amount of the chemicals, so that the device can be widely used for studies about diffusion of the droplets evaporation property of the single droplets and the like tested by water-sensitive paper, as well as tests of the properties of the pesticide, and further has broad application prospects.

This application is a national stage application of PCT/CN2013/084161filed on Sep. 25, 2013, which claims priority of Chinese patentapplication number 201310415264.9 filed on Sep. 12, 2013. The disclosureof each of the foregoing applications is incorporated herein byreference in its entirety.

TECHNICAL FIELD

The present disclosure relates to the technical field of agriculture andparticularly relates to a device and a method for producingquantitative-diameter spray droplets of pesticide.

BACKGROUND ART

Chemical pesticides are widely welcomed by farmers in all countries asan effective means for pest control in plant growth. However, along withextensive use of the chemical pesticides, the consequent problems alsoincrease, for example, soil compaction can reduce the fertility of soilto a certain extent, and bring resistance to increase of the productionof grains; and for example, atmospheric and water pollution can causedamages to human beings and other animals. After years of studies and incombination with foreign technical results, it can be seen that driftdeposition of pesticides becomes one of main sources of the abovedamages. At present, there is still no instrument capable of generatingpesticide droplets with specific particle size, so that the studiesabout the diffusion of the pesticide droplets and the evaporationproperty of the single droplets have not been developed in the realsense and the agricultural production requirements are seriouslyaffected.

Therefore, against the above deficiencies, the present disclosureprovides a device and a method for producing quantitative-diameter spraydroplets of pesticide.

SUMMARY OF INVENTION Technical Problems to be Solved

The technical problems to be solved by the present disclosure are asfollows: there is no instrument capable of generating pesticide dropletswith specific particle size in the prior art, the studies about thediffusion of the pesticide droplets and the evaporation property of thesingle droplets have not been developed in the real sense and theagricultural production requirements are seriously affected.

Technical Solutions

In order to solve the above technical problems, the present disclosureprovides a device for producing quantitative-diameter spray droplets ofpesticide comprising a sliding device positioned on a track and capableof sliding along the track, one end of the sliding device is connectedwith one end of a piston, the other end of the sliding device isconnected with a driving motor through a lead screw, the other end ofthe piston can move in a droplet generator along with the sliding of thesliding device and the droplets in the droplet generator are released bya guide pipe.

Further, the droplet generator is clamped on a support.

Further, a vibration unit for removing bubbles in the droplet generatoris further arranged on the support.

Further, the vibration unit comprises art eccentric counterweight moduleand a buffer module connected with the eccentric counterweight module,the eccentric counterweight module rotates to generate high-frequencyvibration, and the vibration is slowed down to the overflow frequency ofthe bubbles through the buffer module.

Further, the buffer module is made of rubber.

Further, the minimal propulsion precision of the piston is 0.2 mm, andthe diameter of the droplets is 200 μm-750 μm.

Further, the device further comprises a control center and a driver,wherein the driver is used for receiving and obtaining instructions ofthe control center and controlling the driving motor to operateaccording to the instructions.

Further, a mathematical model corresponding to the diameter of thedroplets is

${{0.2{NSn}} = {\frac{4}{3}{\alpha\Pi}\;{Dg}^{3}}},$wherein N is the advanced numerical distance of the piston, Sn is thecross-sectional area of the piston, α is the liquid correctioncoefficient and Dg is the diameter of the droplets.

The present disclosure further provides a method for producingquantitative-diameter spray droplets of pesticide, and the methodcomprises the following steps:

S1. injecting chemicals into a droplet generator;

S2. enabling a driving motor to work and drive a lead screw to rotateand further releasing one droplet in the droplet generator through aguide pipe;

S3. determining the diameter of the released droplet, and calculatingthe liquid correction coefficient through a mathematical modelcorresponding to the diameter of the droplets; and

S4. reproducing the required diameter of the droplets.

Beneficial Effects

Above technical solutions of the present disclosure have the followingadvantages: the driving motor is controlled by the control center; thedriving motor drives the lead screw to rotate; the lead screw drives thesliding device to a designated accurate position on the guide track; andthe piston moves slowly along with the sliding device to extrude thechemicals in the droplet generator quantitatively. The chemicalsextruded by the piston through the motion in a droplet cavity formssmall single droplets through the guide pipe; the droplets with specificparticle size are further generated by precisely controlling theextrusion amount of the chemicals, so that the device can be widely usedfor studies about diffusion property of the droplets, evaporationproperty of the single droplets and the like tested by water-sensitivepaper, as well as tests of the properties of the pesticide, and furtherhas broad application prospects.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a structural schematic diagram a device for producingquantitative-diameter spray droplets of pesticide according to anembodiment of the present disclosure;

FIG. 2 is an enlarged view of the part of a droplet generator accordingto an embodiment of the present disclosure;

FIG. 3 is a schematic diagram of a vibration unit according to anembodiment of the present disclosure;

FIG. 4 is a schematic diagram of principle according to the embodimentof the present disclosure; and

FIG. 5 is a flow diagram of a method for producing quantitative-diameterspray droplets of pesticide according to an embodiment of the presentdisclosure.

In the Figures: 1: control center; 2: driver; 3: driving motor; 4: leadscrew; 5: base; 6: sliding device; 7: track; 8: piston; 9: dropletgenerator; 10: support; 11 guide pipe; 12: calibrated scale, 13: buffermodule; 14: eccentric counterweight module.

DETAILED DESCRIPTION OF THE EMBODIMENTS

The specific implementations of the present disclosure are furtherdescribed in detail in combination with accompanying drawings andembodiments below. The following embodiments are used for describing thepresent disclosure rather than limiting the scope of the presentdisclosure.

As shown in FIG. 1 and FIG. 2, an embodiment of the present disclosureprovides a device for producing quantitative-diameter spray droplets ofpesticide; and the device comprises a base 5, and a support 10 and atrack 7 are arranged on the base 5.

A sliding device 6 is arranged on the track 7; the sliding device 6 ispositioned on the track 7 and can slide along the track 7; one end ofthe sliding device 6 is connected with one end of a piston 8; the otherend of the sliding device 6 is connected with a driving motor 3 througha lead screw 4; and the driving motor 3 is used for producing power toextrude the droplets. The lead screw 4 is a high-precision ball screw.

The piston 8 is shaped like a metal rod and used for moving in an innercavity of a droplet generator 9 to extrude the droplets. The other endof the piston 8 can move in the droplet generator 9 along with thesliding of the sliding device 6. The droplets in the droplet generator 9are released through a guide pipe 11; and the droplet generator 9 isclamped on the support 10. In consideration of the effects, preferably,the guide pipe 11 is communicated with the droplet generator 9; and thedroplets formed by extrusion can flow out along the guide pipe 11, formcircular droplets at the tail end of the guide pipe 11 and smoothly falloff the tail end of the guide pipe 11.

The driving motor 3 is connected with a control center 1 through adriver 2; and the driver 2 is used for receiving and obtaininginstructions of the control center 1 and controlling the driving motor 3to operate according to the instructions. Generally, the control center1 is a computer. The computer is connected with the driver 2 through a232 serial port and used for converting a numerical value of thediameter of the droplets, which is input by a user via the computer, tomachine instructions of the device. The instructions are sent by thecomputer, the minimal propulsion precision of the piston 8 is 0.2 mm;and the single pesticide droplets from 200 μm to 750 μm can beautomatically generated.

As shown in FIG. 3, a vibration unit for removing bubbles in the dropletgenerator 9 is further arranged on the support 10. The vibration unitcomprises an eccentric counterweight module 14 and a buffer module 13connected with the eccentric counterweight module 14. The eccentriccounterweight module 14 rotates to produce high-frequency vibration; andthe vibration is slowed down to the overflow frequency of the bubblesthrough the buffer module 13. In consideration of the cost, the buffermodule 13 is made of rubber.

The vibration unit can ensure that one droplet released by the devicedoes not contain bubbles, the droplets can be released one by one, andthe experimental precision is further ensured. If bubbles are found toexist in chemicals in the operating process, the vibration unit can beused to realize an exhaust function, the bubbles in the dropletgenerator can be automatically removed by extrusion and vibration, andthe bubbles contained in the droplets can be prevented from affectingthe experimental precision.

A mathematical model corresponding to the diameter of the droplets is

${{0.2\;{NSn}} = {\frac{4}{3}\alpha\;\Pi\;{Dg}^{3}}},$wherein N is the advanced numerical distance of the piston, Sn is thecross-sectional area of the piston, α is the liquid correctioncoefficient and α is the ratio of the diameter of the released dropletsto the actually measured diameter of the droplets.

After a user sets the size and the number of the droplets, the computercan send these parameters to the driver through the serial port, and thedriver further completes the next two steps, wherein the first step isthat the volume of the droplets, which corresponds to the diameter ofthe droplets, is automatically calculated; and the second step is thatthe volume is converted to the extrusion distance required for producingthe droplets by the droplet generator. The instructions are generatedafter calculation, and the instructions are sent to the driving motor.The driving motor rotates to drive the sliding device to move on thetrack. According to the instructions of the driver, the sliding devicedrives the piston to be slowly inserted into the droplet generator, andthe insertion distance is precisely controlled.

The piston of a probe needs to advance 1 mm to generate the droplets of200 μm; and generally, the minimal advancing precision of the piston is0.2 mm.

Preferably, a calibrated scale 12 is further arranged on the dropletgenerator 9, the volume of movement of the chemicals, whether thebubbles exist or not and other problems can be observed veryconveniently through scale marks on the calibrated scale 12, and if thebubbles exist, the bubbles can be automatically removed through thevibration unit, and the bubbles contained in the droplets can beprevented from affecting the experimental precision.

As shown in FIG. 4, the principle of the device for producing thequantitative-diameter spray droplets of the pesticide of the presentdisclosure is as follows:

The computer sends the parameters set by the user to the driver. Afterthe driver obtains the transmission instructions, the driving motor iscontrolled to operate, the driving motor drives the lead screw; thesliding device is driven through the lead screw; the sliding deviceperforms horizontal motion on the guide track; the piston is driven toperform piston extrusion motion in the droplet generator; the size ofthe droplets generated by extrusion corresponds to a certain extrusionspace; and the mathematical model corresponding to the parameters hasbeen described above and will not be described here in detail. Thecontrast test of the particle size of the droplets is measured by alaser sensor; and the numerical value of the correction coefficient α isobtained by the contrast test.

For example, one standard droplet with the diameter of 200 μm isreleased; and the particle size is measured through the laser sensor.For example, the particle size is 208 μm, then the value of thecorrection efficient α is calculated, α=200/208; and then the calculatedcorrection coefficient α is input into the computer. The requiredparticle size and the number of the droplets are set, and then therequired accurate standard droplets can be produced.

As shown in FIG. 5, the present disclosure further provides a method forproducing quantitative-diameter spray droplets of pesticide, and themethod comprises the following steps:

S1. injecting chemicals into a droplet generator;

S2. enabling a driving motor to operate and drive a lead screw to rotateand further releasing one droplet in the droplet generator through aguide pipe;

S3. measuring the diameter of the released droplet, and calculating theliquid correction coefficient through a mathematical model correspondingto the diameter of the droplets; and

S4. re-producing the required diameter of the droplets.

In summary, the driving motor is controlled by the control center. Thedriving motor drives the lead screw; the lead screw drives the slidingdevice to a designated accurate position on the guide track; and thepiston moves slowly along with the sliding device to extrude thechemicals in the droplet generator quantitatively. The chemicalsextruded by the piston through the motion in a droplet cavity forms thesmall single droplets through the guide pipe. The droplets with thespecific particle size are further generated by precisely controllingthe extrusion amount of the chemicals, so that the device can be widelyused for studies about diffusion property of the droplets, evaporationproperty of the single droplets and the like tested by water-sensitivepaper, as well as tests of the properties of the pesticide, and furtherhas broad application prospects.

The embodiments above are only preferred embodiments of the presentdisclosure. It should be noted that those skilled in the art can make avariety of improvements and variations without departing from thetechnical principle of the present disclosure, and the improvements andvariations should also be considered to be within the protection scopeof the present disclosure.

What is claimed is:
 1. A device for producing quantitative-diameterspray droplets of pesticide, comprising a slider configured to slidealong a track, wherein the slider is positioned on the track, one end ofthe slider is connected with one end of a piston, the other end of theslider is connected to a first end of a lead screw and a second end ofthe lead screw is connected to a driving motor, the other end of thepiston can move in a droplet generator along with the sliding of theslider and the droplets in the droplet generator are released by a guidepipe, wherein a calibrated scale configured to determine whether bubblesexist in the droplet generator, and a first side of the calibrated scaleis positioned adjacent to the droplet generator, wherein the guide pipeis positioned adjacent to a second side of the calibrated scale, whereinthe guide pipe, the calibrated scale, the piston, the slider, the leadscrew and the driving motor are all on a same first plane, wherein thetrack is arranged on a base which is positioned under the guide pipe,the calibrated scale, the piston, the slider, the lead screw and thedriving motor and on a second plane which is parallel to the firstplane, wherein a vibrator for removing bubbles in the droplet generatoris further arranged on a support, and wherein a minimal propulsionprecision of the piston is 0.2 mm, and the diameter of the droplets is200 μm-750 μm.
 2. The device for producing the quantitative diameterspray droplets of the pesticide according to claim 1, characterized inthat the droplet generator is clamped on the support.
 3. The device forproducing the quantitative-diameter spray droplets of the pesticideaccording to claim 1, characterized in that the vibrator comprises aneccentric counterweight module and a buffer module connected with theeccentric counterweight module, the eccentric counterweight modulerotates to generate high-frequency vibration, and the vibration isslowed down to an overflow frequency of the bubbles through the buffermodule.
 4. The device for producing the quantitative-diameter spraydroplets of the pesticide according to claim 3, characterized in thatthe buffer module is made of rubber.
 5. The device for producing thequantitative-diameter spray droplets of the pesticide according to claim1, further comprising a control center and a driver, wherein the driveris used for receiving and obtaining instructions from the control centerand controlling the driving motor to operate according to theinstructions.
 6. The device for producing the quantitative-diameterspray droplets of the pesticide according to claim 5, wherein theinstructions received by the driver, include controlling the drivingmotor to adjust the size of the droplets based on a mathematical modelcorresponding to a diameter of the droplets is 0.2NSn=4/3 αΠDg³, whereinN is an advanced numerical distance of the piston, Sn is across-sectional area of the piston, a is a liquid correction coefficientand Dg is the diameter of the droplets.